1

Diet:
If medication are not enough you have to consider if the foods you are eating are making the problem worse. Common foods like coffee, tomato sauce, orange juice, etc. Are acid and can make symptoms of gastritis or reflux worse.
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2

Betaine HCL/pepsin:
There are no reported cases on palpitations but theoretically the pepsin/HCL combo could have negative vagal feedback ( vagus stimulation produces pepsin on our stomach). The vagus nerve via parasympathetic stmulation slows the heart and if it is inhibited there could be increase heart rate. You could try stopping the meds and seeing if palpitations stop. Check B6, folate (folic acid) ,B12 .F/U with doc.
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9

Depends:
It depends on why your take it. If you take it because you have an ulcer or precancerous changes in the lining of your esophagus or stomach then i would encourage you to keep taking it. If however, it's just for reflux/heartburn you can try the things recommended on this link: http://www.Mayoclinic.Com/health/heartburn-gerd/ds00095/dsection=lifestyle-and-home-remedies.
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